<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>表格</title>
</head>
<body>

<table border="1px">
    <thead>
        <th>标签</th><th>描述</th>
    </thead>

    <tbody>
        <tr>
            <td>1</td> <td>2</td>
        </tr>
        <tr>
            <td>3</td> <td>4</td>
        </tr>
        <tr>
            <td colspan="2" align="center">sup</td>
        </tr>
        <tr>
            <td rowspan="2">sub</td> <td>定义标签的下标文本</td>
        </tr>
        <tr>
            <td>定义标签的下标文本000</td>
        </tr>

    </tbody>

</table>

</body>
</html>